139445123 has 4 divisors (see below), whose sum is σ = 146784360. Its totient is φ = 132105888.

The previous prime is 139445107. The next prime is 139445147. The reversal of 139445123 is 321544931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139445123 - 2⁴ = 139445107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139445123.

It is not an unprimeable number, because it can be changed into a prime (139445183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3669590 + ... + 3669627.

It is an arithmetic number, because the mean of its divisors is an integer number (36696090).

Almost surely, 2^139445123 is an apocalyptic number.

139445123 is a deficient number, since it is larger than the sum of its proper divisors (7339237).

139445123 is an equidigital number, since it uses as much as digits as its factorization.

139445123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7339236.

The product of its digits is 12960, while the sum is 32.

The square root of 139445123 is about 11808.6884538462. The cubic root of 139445123 is about 518.5625029461.

The spelling of 139445123 in words is "one hundred thirty-nine million, four hundred forty-five thousand, one hundred twenty-three".